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Question

Which one of the following is not an element?

A
Diamond
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B
Ozone
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C
Silica
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D
Graphite
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Solution

The correct option is D Silica
Silicon dioxide is known as silica with molecular formula =SiO2 which is a compound, not an element.
Diamond and graphite are purely made up of carbon i.e C, an element.
Ozone is trioxygen molecule i.e O3, an element.
Hence, the answer is option C.

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